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Mammoth Cave NP, Kentucky
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The Bottomless Pit in Mammoth Cave is approximately 105 feet deep, a depth that was first measured in the 19th century. [Source: National Park Service]
The Bottomless Pit was a significant obstacle for early explorers, and its crossing marked a major milestone in mapping the cave system. [Source: National Park Service]
The pit is a vertical shaft formed by the dissolution of limestone, a common process in the creation of the cave's extensive passages. [Source: National Park Service]
In the 1800s, the Bottomless Pit was one of the most famous features of Mammoth Cave, attracting curious visitors and scientists alike. [Source: National Park Service]
Mammoth Cave, which includes the Bottomless Pit, is the longest cave system in the world, with over 400 miles of explored passages. [Source: National Park Service]
